cores

1 row where category = "Rel"

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category ▼ groupoid
Rel SymmRel

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CREATE TABLE "cores" (
	"groupoid"	TEXT NOT NULL,
	"category"	TEXT NOT NULL UNIQUE,
	PRIMARY KEY("category"),
	FOREIGN KEY("category") REFERENCES "categories"("name") on update cascade on delete restrict,
	FOREIGN KEY("groupoid") REFERENCES "categories"("name") on update cascade on delete restrict
);